and for emergency calls by deaf people.

Popular culture

An acoustic coupler (a Novation CAT 300 baud model) is prominently shown early in the 1983 film WarGames, when character David Lightman (portrayed by actor Matthew Broderick) places a telephone handset into the cradle of a prop acoustic modem to accentuate the act of using telephone lines for interconnection to the developing computer networks of the period--in this case, a military command computer.

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